Suppose a is a 4 x 7 matrix such that rank(a = 4. which of the following is true? a. the rank of at is 3 b. the nullity of a^t is 0 c. ax 0 only has trivial solution d. the rows of a are linearly dependent columns of a are e. linearly independent

Arrange these numbers from least to greatest 3/5 5/7 2/9

Standard deviation of 19,29,21,22,23

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno step statement reason 1 ∠oln ≅ ∠lno given 2 draw oe as a perpendicular bisector to ln by construction 3 ∠leo ≅ ∠neo transitive property of equality 4 m∠leo = 90° definition of a perpendicular bisector 5 m∠neo = 90° definition of a perpendicular bisector 6 le ≅ en definition of a perpendicular bisector 7 δole ≅ δone side-angle-side (sas) postulate 8 ol ≅ on cpctc nina made two errors in the proof. identify and correct the errors.